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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yushiro Uchida | 1988-1988 | 6 | 3 | .667 | 1.62 | 52 | 0 | 0 | 0 | 26 | 72.0 | 47 | 13 | 4 | 40 | 83 |
| Kanko Ueno | 1985-1988 | 5 | 2 | .714 | 3.08 | 59 | 0 | 0 | 0 | 1 | 79.0 | 74 | 27 | 5 | 30 | 33 |
| Andre Ulleri | 2045-2059 | 11 | 9 | .550 | 3.73 | 42 | 29 | 3 | 1 | 0 | 205.1 | 229 | 85 | 20 | 59 | 177 |
| James Ulusu | 2038-2047 | 10 | 8 | .556 | 3.47 | 31 | 27 | 1 | 1 | 0 | 142.2 | 140 | 55 | 14 | 50 | 86 |
| Zackary Umemoto | 2058-2058 | 1 | 4 | .200 | 5.65 | 19 | 7 | 0 | 0 | 1 | 51.0 | 60 | 32 | 9 | 20 | 74 |
| Robby Umlauf | 2028-2039 | 15 | 9 | .625 | 3.74 | 64 | 46 | 0 | 0 | 1 | 271.2 | 276 | 113 | 12 | 128 | 174 |
| Jack Underdown | 1978-1985 | 17 | 39 | .304 | 6.56 | 90 | 76 | 0 | 0 | 0 | 385.1 | 406 | 281 | 41 | 274 | 196 |
| Erik Upton | 2018-2025 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 1 | 0 | 0 | 0 | 0 |
| Armando Ureste | 1992-2014 | 3 | 7 | .300 | 3.84 | 81 | 0 | 0 | 0 | 24 | 117.1 | 128 | 50 | 11 | 37 | 95 |
| Edwin Uribe | 2005-2010 | 13 | 9 | .591 | 3.21 | 28 | 28 | 3 | 0 | 0 | 196.1 | 176 | 70 | 18 | 60 | 152 |
| Monte Uro | 1984-1988 | 2 | 5 | .286 | 2.32 | 88 | 0 | 0 | 0 | 36 | 101.0 | 65 | 26 | 5 | 47 | 123 |
| Juan Urrego | 1982-1987 | 35 | 29 | .547 | 4.30 | 88 | 86 | 2 | 1 | 0 | 477.0 | 528 | 228 | 26 | 195 | 253 |
